Corporate or organizational development is process which allows a company or an organization to develop its internal capacity in order to be as efficient as possible. Long term or short terms (missions) are possible. We do have to understand that there is a definite relation between the achievements of the missions and objectives and the corporate development. Richard Beckhard has an interesting definition about organizational development: "a planned effort, organization-wide, managed from the top, to increase organization effectiveness and health, through planned interventions in the organization's processes, using behavioral science knowledge". Within the corporate topic, we will focus on mergers and acquisitions. Without creating a new entity, these processes allow a given company in a specific industry to grow very quickly. According to, organization development (OD), it is a complex strategy intended to change the beliefs, attitudes, values, and structure of organizations so that they can better adapt to new technologies, markets, and challenges.